Can you find out the missing number in the grid?

Can you make numbers like 24, using numbers 3,3,7 & 7 with any arithmetic operator?

Analyze and find the missing item in the sequence:
16, 06, 68, 88, __, 98

Count the squares in the matchstick puzzle below?

Two boys were admitted to a school. When the headmaster asks them about their parents, they tell him that they have same parents (father and mother). On further inquiry, it turns out that they both share the same date for their birthday.

"Are you twins," ask the headmaster.
"No," replies the boys.

Is it possible?

Can you count the number of squares in the given picture?

The person who makes it has no need for it. He who purchases it does not use it. The person who does use it does not know they are. What is it?

What is the fewest number of coins that would be required in order to make sure each and every coin touches exactly three other coins?

I cry without having a voice.
I fly without having wings.
I bite without having teeth.
I whisper without a mouth.

Who am I?

He runs but never walks. Murmurs, but never talks. Has a bed, but never sleeps. And has a mouth, but never eats?